I wouldn't count on Russian version supporting English language in any official way. You western fellas have to remember that PC games in our (eastern) part of the Europe are sold cheaper to make up for a big difference in earnings of average customer. So these editions of the games are hardcoded to be used in eastern countries only (language, region locking etc.), otherwise some smart guys from the West would immediately buy all copies at half the price here, just to sell them immediately on "your side" and make lots of easy money
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Well, there's always option of cracking/modding "eastern" edition of a game (translating all the interface back to English etc.) but it would definitely take more time compared to waiting one more week/month for UK/US "proper" release.
Cheers.